Valve-grinding device.



hs. A. oswlcs. VALVE GRINDING DEVCE.

APPLICATION FILD iUNE 5. l1915.

Patented. 'Sept'.v 28, 1915.

ijf/g. 2.

tintas sfrafrns are SEYMOUR A. BOSTWICK. OF BOSTON, rMASSACHUSETTSyASSIGNOR OF ONE-THIRD TO CLARENCE A. lGLENTVJORTH AND ONE-THIRDTO HAROLDBOSTON, MASSACHUSETTS.

M. BATER, BOTH OF VALVE-GBINDING DEV'ICE.

Specification of Letters Patent.

Application filed June 5, 1915. Serial No. 32,445.

T01/H llm/l/ 1'15 nit/ l/ crm/5cm.' lie it known that I, SEYMOUR A.Bos'rivicn, a citizen of the United States, resids ing at Boston, in'the county of Suffolk and State of Massachusetts, have invented new anduseful Improvements in Valve-Grinding Devices, of' which the followingis a specification.'

lhis invention relates to improvements in valvel grinding devices andhas for its object to provide a strong, durable and easily operateddevice which may be taken apart,

when not inuse, to occupy very little space.

The invention consists in the combination and arrangement of partswhereby the above object and certain other objects hereinafter appearingmay be attained, as set forth in the following specification andparticularly pointed out in the claims.

Referring to the drawings: Figure 1 isa vertical section partly inelevation of-a device embodying my invention. Fig. 2 is a plan viewpartly in section of the same.

Like numerals refer to'like parts throughout the several viewsofthedrawings. v

ln the drawings, 5 is the stock and 6 the tool'holder of the devicewhich isrnounted to rotate relatively to said stock. Thestock 5 ispreferably made of metal with a cylindrical chamber formed therein andadapted to receive a cylindrical stem 8 which constitutes a part of thetool holder 6. An annular groove S) is formed in the stem S and receivesthe end of a screw 10 having screwthreaded engagement with the stock 5,-which screw retains said stem within the chamber 7 and permits the sameto be rotated therein.

l, rlhe lowerend of the tool holdei' f3 is ref eessed at 11 to-containone end of a tool 12 which tool is secured in said recess preferably bymeans of a screw 13. The outer end of-the tool 12 may be formed innumerous ways according to the character and nature of the work to beperformed. An annular shoulder 14 is formed upon the tool holder 6 andengages a corresponding shoulder 15 formed upon the stock 5, saidshoulders 11 and 15 being formed and arranged to receive the thrust dueto the pressure which is applied to the tool during the operationthereof. i a

A grip'16 1s arranged 'adjacent theupper end of the stock 5 in order tofacilitate the tion may .be imparted to said tool holder.

from said slide. The preferred method of carrying out this feature ofthe invention is to provide a pair of rods 18 and 19 which are. arrangedparallel to each other upon opposite sides of the axis of said toolholder.

- The rod 18 is eonn'eetedat one end to the adjacent end of the rod 19preferably by a cross bar 20, said rodsybeing preferablyV riveted tosaid cross bar. A` T-shaped handle 21 is preferably rotatably scoured to'tween the bars 18 and 19 permitting Said handle to be rotated to aposition best suited to the operator of the device.

One of the parallel rods, preferably the rod 18, is 'provided with aseries of teeth 22 lengthwise thereof and upon the side adja-4 cent theother rod. Said rods are further' more arranged to slide in guides 23and 24 Patented sept. es, 1915. 7

1 the cross bar 20 substantially midway bei' respectively'formed in anenlarged portion 25 of the stock 5.

The tool holder 6 is alsoprovided with an' 'enlargement 26 about theperiphery of which are formed gear teeth 27, which teeth areadapted tomesh with the teeth 22 ofthe rod 18. Said rod constitutes a rack. Theenlargement 26 and the gear teeth 27 constitute a. gear which isarranged with the enlargement-.25 of said stock,said enlargement beingsubstantially cylindrical in shape and hollow to inclose said gear.

As liereinbefore.stated,the rods 18 and 19 are arranged upon oppositesides of the axis of the tool holder 6 and. in order lthat said rods maybe 'placed as near-together as possible and yet constitute suitableguides to control the movements of said slide transversely of said toolholder and to prevent cramping thereof 'said rods are placed indifferent transverse planes, which are arranged substantially parallelwith each otherv and at in order to clear said rod 19, permitting saidright angles tothe median axial line of said tool holder.

The rod 18 is, as hereinbefore stated, arranged in a position so thatits teeth 22 will mesh with the teeth 27 of said gear, while the rod 19is arranged above said rod 18 and the upper face of said gear is cutaway at 28 rod to move freely through its guide 24 Without interferingwith the movements of said gear. 4

To operate the device the proper tool is inserted therein and the rods18 and 19 of the slide 17 inserted in their respective guides 23 and 24,this being the only manner in which said rods maybe inserted owing tothe absence of the teeth on the rod 19. The

grip 16 is held by the operator and the de-f sired pressure appliedthereto. The handle 21 is then grasped by said operator and reciprocatedthe proper distance through the guides 23 and 24, thus transmittinganoscil.v

latory movement to the tool 12 through the tool holder 6.

It will be seen that the guides 23 and 24 fare quite long and entirelysurround the and arranged to reciprocate transversely of said toolholder, and teeth formed upon one of said rods adapted to mesh with theteeth upon said holder.

2; A valve grinding device having, in combination, a stock, a toolholder rotatably mounted in said stock, teeth on said tool holder, arack constructed and arranged to reciprocate in said stock transverselyof said holder and at one side thereof, the teeth of said rack beingadapted to mesh with the teeth of said holder, -a .guide-rod Varrangedupon theopp'osit'e side of thev axis of said' tool.

holder from said rack, means for connecting one end of said rack withthe adjacent end rod and said rack.

3. 4; valve grinding device having, 1n combination, a rotatable toolholder, a gear of said rod, and means to reciprocate said on, said toolholder adapted to rotate there-` with, a stock adapted to receiveportions of said tool-holder, said stock having aV casing adapted tosurround and inclose said gear, a

pair of rods slidablymounted in said casing transversely of said toolholder, teeth formed upon the inner face of one of said rods adapted .tomesh with the teeth of said gear, V

and means to reciprocate saidrods trans- -versely of said holder wherebyan oscilla-l tory motion may be imparted to' saidI tool holder. A y

4. A valve grinding device having, in combination, a stock having acylindrical chamber formed therein and open at one end, a. cylindricalcasing formed integral with said stock adjacent the open end of .v

said cylindrical chamber, a grip secured adjacent to the closed end ofsaid stock, atool holder having a cylindrical stem adapted to lit thecylindrical chamber in said stock, a gear on said tool holder adapted torotate Within said cylindrical casing, said cylin- .s

drical stem having an annular recess formed therein, a screw in saidstock adapted to project into said annular recess and retain said holderwithin said stock, a' rack constructed' andarranged to reciprocatetransversely of said cylindrical casing, the teeth of said rack engagingthe teeth of said gear, a rod constructedand arranged to reciprocate insaid cylindrical casing in parallel relation to said rack, and meansoperatively connecting said rod to saidrack adapted to simultaneouslyreciprocate said. rod andsaid rack transversely of said tool holder.

In testimony whereof I have hereunto `set my hand 1n presence ot twosubscribing Witnesses.

SEYMOUR A. BOSTWICK. Witnesses: CHARLES S. GooDING, SYDNEY E. TAFT.

